Re: [PATCH v21 00/20] Initial support for multi-process Qemu

[Thomas Huth]

On 29/01/2021 17.46, Jagannathan Raman wrote:
> Hi,
>
> This is the v21 of the patchset. This version has the following changes:
>
> [PATCH v18 08/20] io: add qio_channel_readv_full_all_eof &
>                 qio_channel_readv_full_all helpers
>    - Separates out the error handling for (len = 0) & (len < 0)
>    - (len = 0) does not necessarily mean EOF. It could also be
>      a case where only FDs are read, without any data with more data
>      possibly on the way. Addresses this scenario as well, as was
>      pointed out in the feedback from last time.
>
> To touch upon the history of this project, we posted the Proof Of Concept
> patches before the BoF session in 2018. Subsequently, we have posted 20
> versions on the qemu-devel mailing list. You can find them by following
> the links below ([1] - [20]). Following people contributed to the design and
> implementation of this project:
> Jagannathan Raman <jag.raman@oracle.com>
> Elena Ufimtseva <elena.ufimtseva@oracle.com>
> John G Johnson <john.g.johnson@oracle.com>
> Stefan Hajnoczi <stefanha@redhat.com>
> Konrad Wilk <konrad.wilk@oracle.com>
> Kanth Ghatraju <kanth.ghatraju@oracle.com>
>
> We would like to thank you for your feedback in the
> design and implementation of this project. Qemu wiki page:
> https://wiki.qemu.org/Features/MultiProcessQEMU
>
> For the full concept writeup about QEMU multi-process, please
> refer to docs/devel/qemu-multiprocess.rst. Also, see
> docs/qemu-multiprocess.txt for usage information.

 Hi!

FWIW, the x-remote machine can be used to crash QEMU:

$ ./qemu-system-i386 -machine x-remote -device piix3-ide
Segmentation fault (core dumped)

... discovered with the scripts/device-crash-test script.

 Thomas